Derivation of Design Guidelines for Miniature Machine Tools

2004 ◽  
Author(s):  
Nozomu Mishima
Keyword(s):  
Machine Tools ◽  
Metal Cutting ◽  
Evaluation Method ◽  
Design Guidelines ◽  
Design Tool ◽  
Design Stage ◽  
Local Error ◽  
Early Design Stage ◽  
The Difference ◽  
Micro Machine

As has been demonstrated the “microfactory”, which is a miniature manufacturing system proposed by the author and his research group, small machine tools that are comparable in size to their target products lead to large reductions in energy consumption and occupied space. They also increase the flexibility of system reconfiguration because of their low weight and small size. Although it had been thought that micro machine tools might not have sufficient metal cutting capability, experiments showed that were capable of micro mechanical fabrication. However, the design of miniature machine tools has not been fully optimized. For example, the design target of the first prototype, a performable miniature machine (“Micro lathe”), was to make the overall size as small as possible. The author proposed a design evaluation method to roughly estimate machine tool performances during its early design stage. In this paper, the above-mentioned design tool is applied to find suitable miniaturizing strategies. By applying the design tool to the miniaturization of machine tools, it is possible to determine which of the design candidates have the best theoretical performance and which of the local error factors would significantly affect machine performance. From the results of calculation, the tool can clarify the difference of effect of error sources on performances between normal machine tools and miniature machine tools. This leads to some suggestions regarding structures, sizes and suitable machine components. Design guidelines for miniature machine tools can be obtained from the information.

Design Evaluation Method for Miniature Machine Tools Utilizing Form-Shaping Theory

2003 ◽  
Author(s):  
Nozomu Mishima
Keyword(s):  
Machine Tool ◽  
Conceptual Design ◽  
Machine Tools ◽  
Evaluation Method ◽  
Design Guidelines ◽  
Design Tool ◽  
Design Parameters ◽  
Design Evaluation ◽  
Machine Performance ◽  
Positioning Errors

A microfactory is a system that can perform manufacturing processes within a very limited space such as a desktop. However, design optimization of miniature machine tools in microfactories have not been studied enough. Since the miniature machine tool designs are not supported by existing design experience as normal machine tools are, design guidelines for miniature machine tool are strongly demanded. And a design tool to analyze machine performance without prototyping will be also necessary because the miniature machines have wider design choices than normal machine tools have, based on its small size and less constraints. This paper focuses on a robust design tool combining form-shaping theory with the Taguchi method, to roughly estimate performance of miniature machine tools at its conceptual design stages. The effort not only identifies critical design parameters that have significant influence on the machining tolerance, but also determines which structure has the best theoretical performance. The paper tells that the proposing design evaluation method can help machine tool designers in determining the optimum structure of a miniature machine tool. The study also realizes two designs of miniature mills to measure positioning errors. The measurement ensures the design evaluation method can predict the machine performance well enough for usage in conceptual design stages. The paper concludes that the design evaluation method is applicable to a systematic miniaturization of a machine tool.

Cross Method and Design Process for DSF Elements

2017 ◽  
Vol 42 (4) ◽  
pp. 36-43 ◽  
Author(s):  
Sertaç Ilter ◽  
S.Müjdem Vural
Keyword(s):  
Architectural Design ◽  
Natural Ventilation ◽  
Evaluation Method ◽  
Building Envelope ◽  
Design Stage ◽  
Design System ◽  
Human Comfort ◽  
Early Design Stage ◽  
Preliminary Design Stage ◽  
Contemporary Architecture

The double-skin façade (DSF) is one of the most crucial paradigms of building envelope design in last decades. DSF prospects a unified architectural phenomenon based on comfort rank of building driven by the dogmas of aesthetic-glass façade and practical-natural ventilation aspirations. Therefore, the utilization of DSF has been the most prevalent catalyst for architectural design. The study discusses to structure a valid evaluation method focusing on DSF elements in order to fragment human comfort standards within asserting an accurate system in the preliminary design stage. The study significantly examines the tools/ways of integrating DSFs' human comfort parameters in contemporary architecture though a convincing design system. Apparently, the study aims to provide a proposed guideline within a established analyzing system for architects in order to better formation of DSF elements; which refers and promote the human comfort standards. The results demonstrate a modest insight on understanding the potentials of DSF elements in the early design stage significantly following defined architectural conceptions; cooling, lighting, thermal, acoustic and visual comfort intensity. Based on obtained data; study aims to enclose a diminutive knowledge or demonstration of how the concept might work for future development of contemporary architecture within DSF area.

The User Pre-Occupancy Evaluation Method in designer–client communication in early design stage: A case study

2013 ◽  
Vol 32 ◽  
pp. 112-124 ◽  
Author(s):  
Weilin Shen ◽  
Xiaoling Zhang ◽  
Geoffrey Qiping Shen ◽  
Terrence Fernando
Keyword(s):  
Evaluation Method ◽  
Design Stage ◽  
Early Design ◽  
Early Design Stage ◽  
Client Communication

scholarly journals A MODIFIED ANALYTICAL HIERARCHY PROCESS DESIGN EVALUATION METHODS FOR PRODUCT RECOVERY

2021 ◽  
Keyword(s):  
Analytical Hierarchy Process ◽  
Design Guidelines ◽  
Life Cycles ◽  
Product Recovery ◽  
Design Stage ◽  
Design Element ◽  
Design Strategies ◽  
Early Design Stage ◽  
Design Attributes ◽  
Hierarchy Process

The absence of existing standards for product recovery planning and the associated difficulty in prioritising the conflicting design requirements are among the main challenges faced during product design. In this paper, a concept for the Design for Multiple Life-Cycles (DFMLC) is proposed to address this situation. The objective of the DFMLC model is to assist designers in evaluating design attributes of Multiple Life-Cycle Products (MLCP) at the early design stage. The methodology adopted for the evaluation of MLCP design strategies has been based on a modified Analytical Hierarchy Process (AHP). Two mapping matrices of the design guidelines and design strategies concerning MLCP design attributes were developed for the modified AHP model. Disassemblability (> 21 %) was found to be the most important design element for MLCP followed by serviceability (> 20 %) and reassembly (> 12 %).

scholarly journals CONSTRUCTION OF A REGRESSION MODEL OF THERMAL RESISTANCE OF A CONTACT PSEUDO MEDIUM

2021 ◽  
Vol 23 (3) ◽  
pp. 47-54
Author(s):  
A.F. Denisenko ◽  
◽  
L.Yu. Girth ◽  
Keyword(s):  
Thermal Resistance ◽  
Regression Model ◽  
Metal Cutting ◽  
Operating Experience ◽  
Design Stage ◽  
Contact Thermal Resistance ◽  
Limit Values ◽  
Cutting Equipment ◽  
Processing Accuracy ◽  
The Difference

The operating experience of metal-cutting machines made it possible to develop reasonable recommendations for the permissible limit values of temperature for the main subsystems of the machine, which determine the accuracy of processing. However, the decrease in the seriality of the manufactured metal-cutting equipment and the constant improvement of its designs require the development of models that are the basis of engineering techniques that allow at the design stage to predict the thermal picture of the main machine units that affect the processing accuracy. In connection with a significant number of factors influencing the formation of contact thermal resistance, and the difference in the weight of their action, it is proposed to use a pseudolayer (pseudo-medium), consisting of areas of actual contact and cavities filled with air or oil, for their comprehensive consideration in the thermal model of joining parts. To determine the significant factors that dominate the contact thermal resistance, a number of one-factor experiments were carried out. To develop a regression model of temperature change in the contact zone, a PFE of type 24 was performed. The results obtained were verified by the Cochran, Student and Fisher criteria.

Express Model for Load Sharing and Stress Analysis in Helical Gears

2004 ◽  
Vol 127 (6) ◽  
pp. 1161-1172 ◽  
Author(s):  
Raynald Guilbault ◽  
Claude Gosselin ◽  
Louis Cloutier
Keyword(s):  
Computing Time ◽  
Three Dimensional ◽  
Load Sharing ◽  
Helical Gear ◽  
Design Tool ◽  
Design Stage ◽  
3D Fem ◽  
Early Design Stage ◽  
Stiffness Reduction ◽  
Tooth Base

The performance of a gear set is strongly influenced by the manufacturing and assembly quality. Therefore, detailed analyses at the design stage, where the effects of expected assembly and manufacturing errors can be simulated, are crucial. At an early design stage, when contact conditions are addressed, the widely used finite element method (FEM) may still result in unwanted computing time. The paper presents an Express model developed to serve as a fast design tool offering fine simulation and a high precision level. The model establishes load sharing, fillet stresses and pressure distribution along the contacting surfaces of meshing helical gear teeth. The calculations combine the finite strip method with a pseudo-three-dimensional (3D) model of the tooth base solved with finite differences to calculate tooth bending deflexion and fillet stresses. The accuracy of the procedure is demonstrated through 3D FEM models. A contact cell discretization completes the model. This very fast and accurate approach gives the contact pressure distributions resulting from the roll-slide motion of mating teeth. An analysis of a helical gear set in two different assembly positions reveals the effects of edge contact, and exhibits the influence of tooth stiffness reduction near tooth corners.

Optimum Size Consideration of Machine Tools

2007 ◽  
Vol 339 ◽  
pp. 337-342 ◽  
Author(s):  
N. Mishima
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Design Method ◽  
Design Guidelines ◽  
Design Tool ◽  
Design Parameters ◽  
Error Sources ◽  
Machine Performance ◽  
Small Machine ◽  
Tool Performance

As has been demonstrated in the “microfactory” which is a miniature manufacturing system proposed by the author’s research group, small machine tools that are comparable in size to their target products lead to large reductions in energy consumption and area. Experiments showed that they were capable of micro mechanical fabrication. However, the design of miniature machine tools has not been fully optimized. The author proposed a design method to estimate machine tool performance. In this paper, the design tool is applied to find miniaturizing strategies. By applying the design tool, it is possible to determine which of the design parameters and error sources would significantly affect machine performance. From the results of calculation, the tool can clarify the effect of machine tool sizes imposed on the machine performances. This leads to some suggestions regarding machine tool sizes. Finally, design guidelines for miniature machine can be obtained.

A simplified daylighting design tool for high-density urban residential buildings

2001 ◽  
Vol 33 (4) ◽  
pp. 259-269 ◽  
Author(s):  
E Ng
Keyword(s):  
Residential Buildings ◽  
Building Blocks ◽  
Design Tool ◽  
High Density ◽  
Design Stage ◽  
Planning Stage ◽  
Early Design ◽  
Early Design Stage ◽  
Geometrical Properties ◽  
Daylight Performance

The paper describes a simple design tool for architects to estimate daylight performance of high-rise residential buildings in high-density urban sites during the early design stage. The tool is based on a modified version of the original split flux formulae. The tool resolves the formulae to a set of tables relating vertical obstruction angles with horizontal obstruction angles. Given the geometrical properties and the required daylight performances, an architect could work out, at the early design and planning stage, the design configuration of the building block itself, the spacing between building blocks, and the sizes of windows required. Working examples demonstrate how the tool might be used in design.

Recyclability Evaluation Method

2002 ◽  
Author(s):  
Yuzo Hiroshige ◽  
Takayuki Nishi ◽  
Toshijiro Ohashi
Keyword(s):  
End Of Life ◽  
Evaluation Method ◽  
Design Stage ◽  
Recycling Process ◽  
Environmentally Conscious ◽  
Early Design ◽  
Early Design Stage ◽  
Final Treatment ◽  
Product Recycling

Realization of successful recycling of end-of-life products greatly depends on, as well as environmentally conscious, whether the recycling process can be made economically feasible. We regard the ease of product recycling as indispensable in order to realize a feasible recycling process. In order to make products easier to recycle, it is necessary to take the ease of disassembly, processing and final treatment into consideration at the design stage. Therefore, an advanced evaluation method that can evaluate a product’s ease of recycling, with minimal prototyping and testing of the product is required at the early design stage. In answer to this, we have developed the Recyclability Evaluation Method (REM). In this paper, the theory of the method, procedure and the structure of the system are presented and a number of application examples are given.

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